Bobbin for sewing-machne shuttles.



L. WEAVER. BOBBIN FOR SEWING MACHINE SHUTTLES. APPLICATION FILED JAN.28.H1 18.

1,278,262, I Patented 10, 1918.

3% v joey @2050 7* lwcv'zasiffi aw? e7" LUCIUS E. WEAVER, OF EAST HAMPTON, CONNECTICUT, ASSIGNOR TO SUMMIT THREAD COMPANY, OF EAST HAMPTON, CONNECTICUT, A CORPORATION OF MAINE.

BOBIBTN FOR SEWING-MACHINE SHUTTLES.

To all whom it may concern:

Be it known that I, Lucius E. WEAVER, a citizen of the United States, residing at East Hampton, in the county of Middlesex and State of Connecticut, have invented new and useful Improvements in Bobbins for Sewing-Machine Shuttles, of which the following is a specification.

This invention relates to a bobbin for use with a sewing-machine shuttle having a bobbin chamber, inner and outer bobbin abutments at opposite ends of the chamber, the said bobbin comprising a body tube surrounded by a winding of thread, and heads detachably engaged with opposite ends of the. tube, the bobbin being rotatable between said abutments to give ofl thread, and the outer abutment being displaceable to permit the insertion and removal of the obbin. The object of the invention is to provide an improved construction of one of said heads, whereby the head is equipped with aninseparably connected tension device adapted to prevent objectionably free rotation of the bobbin, so that the bobbin is not liable to be rotated by its own momentum faster than the call for the thread, and cause slack thread in the chamber or between the winding of thread on the bobbin and the usual tension .devices being there fore prevented.

The invention is embodied in the improve -ments WllJCll I Wlll now proceed to describe and claim.

Of the accompanying drawings forming a part of this specification,

Figure 1 is a side view of a'rotary shuttle to which my invention is applicable.

Fig, 2 is a section on line 22 of Fig. 1.

Fig. 3 is a plan view of one of the bobbin heads.

r Fig. 4 is a section on line H of Fig. 3.

Fig. 5 isa longitudinal section of a reciprocating shuttle to which my invention is applicable.

The same reference characters indicate the same parts in all of the figures.

Referring first, to Figs. 1 and 2, which show a shuttle which may be either rotated or oscillated in the performance of its function, 12 represents the areuate body of the shuttle. and 13 the beak thereof. In this type of shuttle the bobbin is held in a chamber formed by a cylindrical bobbin-case 14, open at its outer end and closed at its inner Specification of Letters Patent. Patented Se t, 10, 1918. Application filed January 28, 1918.

Serial No. 214,116.

end, the latter being provided with an ear 15 which is connected by a pivot stud 16 with the body 12, so that the bobbin case may be swung laterally relatively to the body, to permit. the insertion and removal of a bobbin. The closed end of the bobbincase is provided with a stud or post 17, which constitutes an inner bearing or abutment for the bobbin. One end of the body 12 is provided with a finger 18 which projects over the open end of the bobbin-case 14, and constitutes a stop or outer abutment, preventing the removal of the bobbin when the bobbin-case and shuttle body are in their normal relative positions.

The bobbin shown by Fig. 2 includes a tubular body 19, which is preferably a cop tube of paper, or like material, on which is formed an annular winding'20 of thread, by what is known as auniversal winding operation, the cop tube and the body of thread wound thereon constituting in effect a single part of the bobbin, adapted to be stored, marketed, and handled as such, the bobbin being completed by assembling with the tubular body 19 and thread winding 20, an inner head 21, and an outer head 22. These heads are adapted to be separably and. frictionally engaged with the ends of the tubular body 19, each head having a stud formed to closely fit the bore of said body, and to be retained therein by friction, the stud being removable from the bod The construction of the bobbin an shuttle thus far described is common and well known, the head 22 being provided with a stud 23 which is solid, as usual. Heretofore, the stud on the opposite head 21 has also been solid, the head 21 and its stud. being duplicates of the head 22 and stud 23. It has been customary heretofore to allow the central portion of the head 21 to bear directly on the inner abutn'ient 17, the head 22 hearing at the same time on the outer abut- -n1ent 18. The abutments 17 and 18 are spaced apart to permit the bobbin to be inserted loosely between them. The bobbin is therefore adapted to rotate so loosely between the abutments 17 and 18 that when the bobbin is rotated by the thread pulled therefrom, the rotation of the bobbin is liable to be continued by the momentum of the bobbin, to such an extent that loose thread accumulates in the bobbin-case, or between the winding 20 on the bobbin and .35 As shown in 5 tion, I provide the bobbin with a spring pressed member, yieldingly projecting from one of its heads, and adapted to bear on the inner abutment 17 and press the other head against the outer abutment. 18, witirsufiito the rotation of the bobbin sufficient to prevent the bobbin from being rotated by plunger, a stop member cooperating with a complemental stop member on the plunger, and an abutment for one ,end of a helical spring 28. The plunger is provided with an enlargement 29, bore of the stud 26, and constitutlng a shoulder on which the opposite end of the spring 28 bears. The shank of the plunger is enlarged or upset to form a head 30, located outside the stud and adapted to f; bear on the flange 27 as a oomplemental stop "member, said head and flange limiting the "projection of the plunger from the head 21 by the spring 28.

Fig. 4:, when the head 21 1s removed from the shuttle, the plunger 25 is projected from the outer face of the head 21 as far as the stop members 27 and 30 permit. As shown by Fig. 2, when the bobbin is inserted in the shuttle, the plunger 25 bears on the inner abutment 17, and is caused, when the outer bobbin 18 is in place, to press the outer head 22 against the abutment 18, the spring 28 being compressed and acting to press the head 22 against the abut ment 18 with sufficient force to prevent the bobbin from being rotated by its own momentum Provision is therefore made for preventing the liability of an accumulation gf loose thread in the bobbin-case or chamer. The plunger 25 is preferably in axial alinement with the bobbin body 19, and the inner abutment .17 is preferably provided with a recessedstep 31 engaging the outer end of the plunger, as shown by Fig. 2.

' As shown by Fig. 5, my invention may be embodied in a reciprocating shuttle 32, the bodyof which has a bobbin chamber 33, 1 closedat one end and having in its closed lend a recessed step 31 engaging the plun- ,ger 25;; The bobbin is in all respects, exceptng si'z'e and proportion, a duplicate of the ji bobbin above; described, the inner head 21 fifi being provided with a tubular stud in which cient force .to create a frictional resistancethe reduced stem or shank portion of the' having a sliding fit in the the plunger 25 is movable, and the outer head 22 being pressed by the plunger and its spring against an outer abutment 34 at the open end of the bobbinchamber 33.

The spring-pressed member 25 is located It will now be seen that the bobbin is distinguished from sectional bobbins as heretofore made, by the fact that the bobbin in 'cludes a combined bobbin member and tension device embodied in the head 21, tubular stud 26, plunger 25, and spring 28. The

stop member 30 on the plunger is outside the stud, so that it may be formed by upsetting the inner end of the plunger after the insertion of the plunger in the stud. After the stop member 30 is formed, the plunger is inseparably connected with the stud and head, its outward movement being limited by the stop members 27 and 30, and its inward movement by the stop member 27 and spring 28.

It will also be seen that the head 21,

formed to cover one end of a winding of thread on a cop tube, and having means for frictionally engaging said tube, and the tension device which includes the spring 28 and the plunger 25, are permanently connected by the means illustrated, so that the head and tension device are adapted to be applied to and removed from the cop tube as a single part. The operation of assembling the cop tube, with its winding, and the heads 21 and 22, therefore provide the bobbin with a tension device which is a part of the bobbin and is rendered operative by the insertion of the bobbin in the shuttle.

I claim:

1. In a shuttle bobbin of the character.

stated, a bobbin head formed to cover one end-of a winding of thread on a cop tube forming a part of the bobbin, said head being provided with a fixed tubular stud projecting from its inner side and formed to enter and frictionally engage the cop tube, and having a fixed spring abutment, the head being also provided with a tension device including a spring seated on said abutment, and a plunger movable in the stud and adapted to be projected by saidspring from the outer side of the head, stop means being provided for limiting the projection of the plunger by the spring.

2. In a shuttle bobbin .of the character stated, a combined bobbin member and tension device comprising a bobbin head, a tubular stud projecting from the inner side of said head, and adapted to frictionally engage a cop-tubegsaid stud being provided at its outer end with an igwardly projecting annular flange contracting a portion of exerting outward pressure on the plunger, 10 the bore of the stud, and constituting a the reduced portion of the plunger being spring abutment, said bore extending from provided with a stop member located outside the outer side of the head to said tinge, a the stud and cooperating with said flange in plunger having an enlarged portion fitting limiting the outward movement of the plunand mo *able in said bore, and a reduced porger by the spring. 15 tlon fitting and movable in said flange and in testimony whereof I have atlixed my a spring interposed between said flange and signature. the enlar ed )ortion. of the ilun 'er. and LUCIUS .l. WEAVIJR.

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